Trying to make glossy volume shapes
Here's another approach you could try:


Make sure your text object is extruded slightly, then convert it to a mesh by pressing AltC.
The mesh object will be a total mess. Use a Remesh modifier to subdivide it a bit more uniformly. You need quite a high level of subdivision here; in the image below, the middle object was subdivided with an octree depth of 6, but 7 would have been better.
Apply the Remesh modifier, enter edit mode and convert the object into a 2D shape by deleting one side of the object. Adjust the normals if you need to.
Now the slightly tedious part — you have to select all the vertices around the outside edges of the object. With vertex or edge select enabled, you can pick up multiple vertices by Alt clicking on the outer edges. Takes a while though...





Save these vertices as a vertex group. Exit edit mode and add a Cloth modifier to the object. Then go to the Physics tab, select "Pinning", and select your vertex group in the space below.
Change the Structural stiffness to something much smaller (e.g., 0.1).
Finally go to the Scene tab, make sure gravity is active, and change the direction so that it works in the direction you want the text to bulge out. Press the Play button in the timeline, and hopefully you'll see something like this: